public Dictionary <TourSampleItem, int> SampleAndReturnTourDestinations(ISamplingUtilities samplingUtilities)
{
TourSampleItem[] sampleItems = new TourSampleItem[_sampleSize];
for (int i = 0; i < _sampleSize; i++)
{
TourSampleItem sampleItem;
RandomUniform01 randomUniform01 = new RandomUniform01(samplingUtilities.SeedValues[i]);
int nullDestinationCounter = 0;
// draw repeatedly until a sample item is drawn
do
{
sampleItem = GetDestination <TourSampleItem>(randomUniform01, _originParcel, _originSegmentZone, _excludedParcel, _excludedSegmentZone);
if (sampleItem != null)
{
sampleItems[i] = sampleItem;
}
else
{
++nullDestinationCounter;
if ((nullDestinationCounter % NULL_DESTINATION_WARNING) == 0)
{
OutputDebugForFailedDestination
(samplingUtilities, nullDestinationCounter);
if (nullDestinationCounter >= NULL_DESTINATION_ERROR)
{
throw new Exception(OutputDebugForFailedDestination
(samplingUtilities, nullDestinationCounter));
}
}
} //end else got null returned
} while (sampleItem == null);
} //end loop for _sampleSize
Dictionary <TourSampleItem, int> sample = new Dictionary <TourSampleItem, int>();
bool skipChoiceProbabilityCalculator = true;
foreach (TourSampleItem sampleItem in sampleItems)
{
// SetAlternative will store the associated alternative for the sample item and calculate the sampling probabilities
sampleItem.SetAlternative(this, sample, _chosenParcel != null && _chosenParcel.Id == sampleItem.ParcelId, AlternativeType.Default, skipChoiceProbabilityCalculator);
}
//JLB 20120329
// if (_choiceProbabilityCalculator.ModelIsInEstimationMode) {
if (_choiceProbabilityCalculator.ModelIsInEstimationMode && _chosenParcel != null)
{
// creates a tour sample item that represents the chosen alternative
if (_usualParcel == null || _usualParcel.Id != _chosenParcel.Id)
{
TourSampleItem chosenSampleItem = new TourSampleItem();
chosenSampleItem.Initialize(this, _chosenParcel.Id, _chosenParcel.Sequence, _chosenSegmentZone);
chosenSampleItem.SetAlternative(this, sample, true, AlternativeType.Chosen, skipChoiceProbabilityCalculator);
}
else if (_usualParcel.Id == _chosenParcel.Id)
{
TourSampleItem chosenSampleItem = new TourSampleItem();
chosenSampleItem.Initialize(this, _chosenParcel.Id, _chosenParcel.Sequence, _chosenSegmentZone);
chosenSampleItem.SetAlternative(this, sample, true, AlternativeType.Usual, skipChoiceProbabilityCalculator);
}
if (_usualParcel != null && _usualParcel.Id != _chosenParcel.Id)
{
TourSampleItem usualSampleItem = new TourSampleItem();
usualSampleItem.Initialize(this, _usualParcel.Id, _usualParcel.Sequence, _usualSegmentZone);
usualSampleItem.SetAlternative(this, sample, false, AlternativeType.Usual, skipChoiceProbabilityCalculator);
}
}
else if (_usualParcel != null)
{
// creates a tour sample item that represents the usual alternative
TourSampleItem usualSampleItem = new TourSampleItem();
usualSampleItem.Initialize(this, _usualParcel.Id, _usualParcel.Sequence, _usualSegmentZone);
usualSampleItem.SetAlternative(this, sample, false, AlternativeType.Usual, skipChoiceProbabilityCalculator);
}
foreach (KeyValuePair <TourSampleItem, int> sampleItem in sample)
{
// calculates adjustment factor for each tour sample item
if (sampleItem.Key.Probability >= Constants.EPSILON)
{
sampleItem.Key.AdjustmentFactor = -Math.Log(_sampleSize * sampleItem.Key.Probability / sampleItem.Value);
}
//not called in this version
//samplingUtilities.SetUtilities(sampleItem.Key, sampleItem.Value);
}
return(sample);
}
public Dictionary <TourSampleItem, int> SampleAndReturnTourDestinations(ISamplingUtilities samplingUtilities)
{
var sampleItems = new TourSampleItem[_sampleSize];
for (var i = 0; i < _sampleSize; i++)
{
TourSampleItem sampleItem;
var randomUniform01 = new RandomUniform01(samplingUtilities.SeedValues[i]);
// draw repeatedly until a sample item is drawn
do
{
sampleItem = GetDestination <TourSampleItem>(randomUniform01, _originParcel, _originSegmentZone, _excludedParcel, _excludedSegmentZone);
if (sampleItem != null)
{
sampleItems[i] = sampleItem;
}
} while (sampleItem == null);
}
var sample = new Dictionary <TourSampleItem, int>();
bool skipChoiceProbabilityCalculator = true;
foreach (var sampleItem in sampleItems)
{
// SetAlternative will store the associated alternative for the sample item and calculate the sampling probabilities
sampleItem.SetAlternative(this, sample, _chosenParcel != null && _chosenParcel.Id == sampleItem.ParcelId, AlternativeType.Default, skipChoiceProbabilityCalculator);
}
//JLB 20120329
// if (_choiceProbabilityCalculator.ModelIsInEstimationMode) {
if (_choiceProbabilityCalculator.ModelIsInEstimationMode && _chosenParcel != null)
{
// creates a tour sample item that represents the chosen alternative
if (_usualParcel == null || _usualParcel.Id != _chosenParcel.Id)
{
var chosenSampleItem = new TourSampleItem();
chosenSampleItem.Initialize(this, _chosenParcel.Id, _chosenParcel.Sequence, _chosenSegmentZone);
chosenSampleItem.SetAlternative(this, sample, true, AlternativeType.Chosen, skipChoiceProbabilityCalculator);
}
else if (_usualParcel.Id == _chosenParcel.Id)
{
var chosenSampleItem = new TourSampleItem();
chosenSampleItem.Initialize(this, _chosenParcel.Id, _chosenParcel.Sequence, _chosenSegmentZone);
chosenSampleItem.SetAlternative(this, sample, true, AlternativeType.Usual, skipChoiceProbabilityCalculator);
}
if (_usualParcel != null && _usualParcel.Id != _chosenParcel.Id)
{
var usualSampleItem = new TourSampleItem();
usualSampleItem.Initialize(this, _usualParcel.Id, _usualParcel.Sequence, _usualSegmentZone);
usualSampleItem.SetAlternative(this, sample, false, AlternativeType.Usual, skipChoiceProbabilityCalculator);
}
}
else if (_usualParcel != null)
{
// creates a tour sample item that represents the usual alternative
var usualSampleItem = new TourSampleItem();
usualSampleItem.Initialize(this, _usualParcel.Id, _usualParcel.Sequence, _usualSegmentZone);
usualSampleItem.SetAlternative(this, sample, false, AlternativeType.Usual, skipChoiceProbabilityCalculator);
}
foreach (var sampleItem in sample)
{
// calculates adjustment factor for each tour sample item
if (sampleItem.Key.Probability >= Constants.EPSILON)
{
sampleItem.Key.AdjustmentFactor = -Math.Log(_sampleSize * sampleItem.Key.Probability / sampleItem.Value);
}
//not called in this version
//samplingUtilities.SetUtilities(sampleItem.Key, sampleItem.Value);
}
return(sample);
}
